circles do not scale when map is pitched

[samanpwbb]

mapbox-gl-js version: all versions

Steps to Trigger Behavior

Create a circle layer, set pitch to anything besides zero.

Expected Behavior

Circles are scaled based on distance: closer circles should be larger.

Actual Behavior

Circles are unscaled:

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It was also unexpected that circles wouldn't be oriented with the map when enabling pitch, but that is already tracked in #2420